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A 16-year-old teen died Saturday after a pre-existing medical condition caused him to fall from an all-terrain vehicle in West Valley City.

John Gleason, spokesman for the Utah Department of Transportation, said the boy was test driving the vehicle with his father, a maintenance worker, in a UDOT parking lot at 5791 W. 2100 South. The father was making a turn when the boy slumped over and fell out of the vehicle, striking the pavement. A medical helicopter transported the teenager to University Hospital at 3:40 p.m. on Saturday.

Gleason said the medical condition, rather than the fall, caused the death of the boy, who has not yet been identified.

The vehicle is slightly larger than a four-wheeler with side-by-side seating and a steering wheel. The vehicle has a top speed of about 10 mph. Gleason said West Valley City Police are investigating the accident.

"There are a lot of UDOT employees that are hit really hard by this," Gleason said. "We want to send our thoughts and prayers to the family."